Test equipment CT simulators · AcQsim family

Philips Picker AcQsim: troubleshooting and error codes

The ServiceForge knowledge base holds 31 documented symptoms for the Philips Picker AcQsim, with 33 ranked causes, 63 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Calibration: Alignment of laser system - Non X-ray test

Daily QA procedure to verify lateral wall, sagittal wall, and ceiling lasers are correctly aligned to gantry and table for accurate isocenter marking

Ranked causes

1. Lateral wall laser misaligned with gantry and table (unknown)
2. Sagittal laser misaligned with gantry and table (unknown)

First check

Zero sagittal laser at control panel

Test point: Sagittal laser
Expected: Zeroed

4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: table reproducibility under gantry and console controls

Verify reproducibility of table position under both gantry and console control in longitudinal and vertical directions

Ranked causes

1. Table positioning mechanism drift or calibration loss (occasional)
2. Console control positioning error (occasional)

First check

Measure table position reproducibility under gantry control in longitudinal direction

Test point: table
Expected: within 1.0 mm of specified position, ±1.0 mm

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Alignment of localization lasers (X-ray and non-X-ray) caution

Congruence of localization lasers should be verified to ensure CT scanner isocenter and table center are accurately indicated; laser accuracy within specified tolerance

Ranked causes

1. Laser misalignment or drift from specified position (occasional)

First check

Measure laser position relative to CT scanner isocenter

Test point: isocenter
Expected: within +1.0 mm of specified values, +1.0 mm

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Horizontal table movements

Monthly verification of horizontal (lateral and longitudinal) table motion for patient positioning

Ranked causes

1. Horizontal table movements require monthly verification (common)

First check

Test horizontal table movements

Test point: Horizontal table motion mechanisms
Expected: Smooth motion in both horizontal directions

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser alignment

Daily QA procedure for sagittal wall laser and lateral lasers alignment verification

Ranked causes

1. Lasers out of alignment (unknown)

First check

Alignment of sagittal wall laser

Test point: Sagittal wall laser
Expected: Within alignment tolerance

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser alignment accuracy radiation

Verify congruence of CT scanner localization lasers (X-ray and non-X-ray) to ensure isocenter and table center are accurately indicated

Ranked causes

1. Laser misalignment from specified values (unknown)

First check

Verify laser position accuracy

Test point: Isocenter and table center
Expected: within +1.0 mm of specified values, +/-1.0 mm

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser alignment verification

Yearly comprehensive alignment of all laser systems for continued accuracy

Ranked causes

1. Laser systems require yearly alignment verification (common)

First check

Verify all laser system alignments

Test point: All laser positioning references
Expected: All lasers properly aligned

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser and radiation field coincidence radiation

Yearly verification that laser positioning lights align with actual radiation field for scan accuracy

Ranked causes

1. Laser and radiation field require yearly coincidence verification (common)

First check

Verify laser and radiation field alignment

Test point: Laser position and radiation field boundaries
Expected: Laser lights coincident with radiation field

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser localization alignment patient safety

Localization lasers may not accurately indicate CT scanner isocenter and table center; accuracy drift requires verification against specified values

Ranked causes

1. Laser alignment drift from specified position (occasional)

First check

Measure laser position deviation from isocenter and table center

Test point: CT scanner isocenter and table center
Expected: Within +1.0 mm of specified values, +1.0 mm

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser offset

Update external lateral laser offset distance between scanner isocenter and laser plane after alignment adjustments

Ranked causes

1. Offset value changed after alignment adjustments (common)

First check

Measure offset value according to procedure

Test point: External lateral lasers vs scanner isocenter
Expected: Distance measurement in mm

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser system alignment

Daily QA procedure to verify lateral wall, sagittal wall, and ceiling lasers are correctly aligned with gantry and table for accurate isocenter marking.

Ranked causes

1. Lateral or sagittal laser misaligned with gantry and table (unknown)

First check

Zero sagittal laser at control panel

Test point: control panel sagittal laser
Expected: zeroed

5 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Laser system alignment with X-ray radiation

Weekly X-ray test alignment of laser system to verify coincidence with radiation field

Ranked causes

1. Laser system requires weekly X-ray alignment verification (common)

First check

Verify laser system alignment with X-ray exposure

Test point: Laser and radiation field alignment
Expected: Laser and X-ray field properly coincident

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Localization light accuracy

Monthly verification of positioning light accuracy for proper scan region localization

Ranked causes

1. Localization light accuracy requires monthly verification (common)

First check

Verify localization light accuracy

Test point: Positioning light alignment
Expected: Light accurately marks scan region

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Pilot localization accuracy

Yearly verification of pilot light accuracy for initial patient positioning

Ranked causes

1. Pilot localization accuracy requires yearly verification (common)

First check

Verify pilot localization light accuracy

Test point: Pilot light positioning
Expected: Pilot light marks correct anatomical position

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Sagittal laser assembly

Periodic calibration of laser tracker unit (LTU) to correct distance measurements from CT data. Performed when measured values differ >1 mm from previous readings.

Ranked causes

1. Calibration values drift >1 mm from baseline (occasional)

First check

Measure sagittal laser calibration data

Test point: LTU control unit
Expected: Compare to previously recorded values

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Sagittal tracking laser

Verify alignment and calibration of sagittal laser tracking unit; establish relationship between distance moved at unit and distance at isocenter

Ranked causes

1. Sagittal laser drift or misalignment (occasional)

First check

Verify mechanical accuracy at sagittal laser unit

Test point: Sagittal laser unit
Expected: in excess of 0.1 mm accuracy with stringent rotational limits, > 0.1 mm

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: sagittal tracking laser alignment

Sagittal laser tracking unit requires periodic alignment and calibration to verify relationship between distance moved at unit and distance measured at isocenter; laser line projected over 3.5 meters or greater

Ranked causes

1. Calibration drift or mechanical disturbance of sagittal tracking laser (occasional)

First check

Verify laser line projection distance

Test point: sagittal laser unit
Expected: 3.5 meters or greater

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Sagittal tracking unit

Monthly calibration of sagittal tracking unit for accurate patient positioning along scanner axis

Ranked causes

1. Sagittal tracking unit requires monthly calibration (common)

First check

Perform sagittal tracking unit calibration

Test point: Sagittal tracking mechanism
Expected: Tracking unit within specification

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: table increment and laser/radiation field coincidence patient safety

Verify accurate laser/radiation field coincidence and table increment to enable accurate correlation of slice thickness with patient's anatomical structures

Ranked causes

1. Laser and radiation field misalignment or drift (occasional)

First check

Measure difference between laser and radiation field center

Test point: isocenter
Expected: not exceed +1.0 mm, ±1.0 mm

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Table position reproducibility

Verify table position reproducibility under both gantry and console controls in longitudinal and vertical directions

Ranked causes

1. Table positioning drift or mechanical wear (occasional)

First check

Measure table position reproducibility under gantry control - longitudinal direction

Test point: Table position, in/out of scanner
Expected: within 1.0 mm of specified position, 1.0 mm

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Table reproducibility

Verify table position reproducibility under both gantry and console controls in longitudinal and vertical directions

Ranked causes

1. Table position drift or mechanical play in gantry or console controls (unknown)

First check

Measure table position reproducibility - longitudinal direction

Test point: Table position under gantry control
Expected: within 1.0 mm of specified position, +/-1.0 mm

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Tracking unit positioning accuracy patient safety

Sagittal laser positioning must be accurate to 0.5mm for correct patient isocenter determination.

Ranked causes

1. Tracking unit misalignment (unknown)

First check

Prepare calibration surface

Test point: Vertical film holder front face
Expected: Level surface with graph paper taped

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Horizontal table position out of tolerance

Table horizontal movement does not reach expected 300 mm displacement

Ranked causes

1. Gantry or console control horizontal drive mechanism out of adjustment (unknown)

First check

Verify horizontal motion displacement gantry control positive

Test point: Horizontal axis into gantry
Expected: 300 mm

Laser offset requires updating in configuration

External lateral lasers no longer accurately mark isocenter plane after alignment adjustments; offset value has changed by millimeters

Ranked causes

1. Isocenter plane shifted after alignment adjustments (occasional)

First check

Measure offset value between actual isocenter plane and external lateral laser plane

Test point: Isocenter plane vs. external lateral lasers
Expected: Recorded offset value from measurement procedure

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Laser/radiation field coincidence error radiation

Misalignment between radiation field and light field in CT simulator during quality assurance testing

Ranked causes

1. Laser and radiation field not aligned (unknown)

First check

Measure error between radiation field and light field

Test point: Laser/radiation field
Expected: 2 mm slice: +/-2.0 mm; 5 mm slice: +2.0 mm; 10 mm slice: +2.0 mm, See expected by slice thickness

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Laser/radiation field misalignment radiation

Light field does not coincide with radiation field during CT simulation setup

Ranked causes

1. Laser alignment drift or mechanical misalignment (unknown)

First check

Measure error between radiation field and light field at 2mm slice thickness

Test point: Laser and radiation field
Expected: +/-2.0 mm, +/-2.0 mm

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Lasers misaligned beyond tolerance

Paper clip or phantom image offset from scanner isocenter exceeds 2 mm tolerance

Ranked causes

1. Lateral or sagittal laser drift or mechanical shift (unknown)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Lateral lasers misalignment

Lateral lasers not properly aligned for CT simulator positioning

Ranked causes

1. Laser alignment drift or mechanical shift (unknown)

First check

Verify lateral laser alignment

Test point: Lateral lasers
Expected: Properly aligned

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pilot localization accuracy error exceeds tolerance patient safety

Light field defined by laser line does not align with metallic marker within specified tolerance in X, Y, or Z dimensions

Ranked causes

1. Pilot localization misalignment (unknown)

First check

Measure localization error in X dimension

Test point: Light field and metallic marker alignment
Expected: ≤ 0.5 mm maximum error; ≤ 1 mm all dimensions, ≤ 1 mm

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Sagittal wall laser misalignment

Sagittal wall laser not properly aligned for CT simulator positioning

Ranked causes

1. Laser alignment drift or mechanical shift (unknown)

First check

Verify sagittal wall laser alignment

Test point: Sagittal wall laser
Expected: Properly aligned

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vertical table position out of tolerance

Table vertical movement does not reach expected 150 mm displacement

Ranked causes

1. Gantry control vertical drive mechanism out of adjustment (unknown)

First check

Verify vertical motion displacement gantry control positive

Test point: Vertical axis upwards
Expected: 150 mm

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.